I was interested in purchasing two belts, one of each color, but can't do that in one instance. I would have to purchase two separate times, and as such pay shipping twice. Is there any way to fix this?

Create 1 order with the quantity you need, then email support@massdrop.com and ask to change it to what you need. ie. 2 Nature 30, 1 sunset brown 32 etc. The change won't reflect on your transaction screen; but they do put a note on your order and ship according to whatever you told them once they received the products.